|Year|Date|Winner|Result|Loser|Attendance|Location|
|---|---|---|---|---|---|---|
|1980|Oct 19|Chicago Bears|24-7|Detroit Lions||Chicago, Illinois|
|1980|Nov 27|Chicago Bears|23-17 (OT)|Detroit Lions|58,508|Pontiac, Michigan|
|1981|Oct 19|Detroit Lions|48-17|Chicago Bears|75,397|Pontiac, Michigan|
|1981|Nov 22|Detroit Lions|23-7|Chicago Bears|71,273|Chicago, Illinois|
|1982|Sept 12|Detroit Lions|17-10|Chicago Bears|50,082|Pontiac, Michigan|
|1982|Nov 21|Chicago Bears|20-17|Detroit Lions|46,783|Chicago, Illinois|
|1983|Oct 16|Detroit Lions|31–17|Chicago Bears|66,709|Pontiac, Michigan|
|1983|Oct 30|Detroit Lions|38-17|Chicago Bears|58,764|Chicago, Illinois|
|1984|Nov 18|Chicago Bears|16-14|Detroit Lions|54,911|Chicago, Illinois|
|1984|Dec 16|Chicago Bears|30-13|Detroit Lions|53,252|Pontiac, Michigan|
|1985|Nov 10|Chicago Bears|24-3|Detroit Lions|53,467|Chicago, Illinois|
|1985|Dec 22|Chicago Bears|37-17|Detroit Lions|74,042|Pontiac, Michigan|
|1986|Oct 26|Chicago Bears|13-7|Detroit Lions|62,064|Chicago, Illinois|
|1986|Dec 15|Chicago Bears|16-13|Detroit Lions|75,602|Pontiac, Michigan|
|1987|Nov 22|Chicago Bears|30-10|Detroit Lions|63,357|Chicago, Illinois|
|1988|Oct 9|Chicago Bears|24–7|Detroit Lions|64,526|Pontiac, Michigan|
|1988|Dec 11|Chicago Bears|13-12|Detroit Lions|55,010|Chicago, Illinois|
|1989|Sept 24|Chicago Bears|47-27|Detroit Lions|71,418|Pontiac, Michigan|
|1989|Dec 10|Detroit Lions|27-17|Chicago Bears|52,650|Chicago, Illinois|

Question: what number of dates were won by the chicago bears?
Answer: 13